Skip canvas filter construction in frameless documents

third_party/WebKit/Source/modules/canvas2d/CanvasRenderingContext2DState.cpp

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "modules/canvas2d/CanvasRenderingContext2DState.h"
 
 #include "core/css/CSSFontSelector.h"
 #include "core/css/resolver/FilterOperationResolver.h"
 #include "core/css/resolver/StyleBuilder.h"
 #include "core/css/resolver/StyleResolverState.h"
@@ skipping 275 matching lines @@
 {
     context->clearFilterReferences();
     context->addFilterReferences(filters, canvasElement->document());
 }
 
 SkImageFilter* CanvasRenderingContext2DState::getFilter(Element* styleResolutionHost, IntSize canvasSize, CanvasRenderingContext2D* context) const
 {
     if (!m_filterValue)
         return nullptr;
 
+    // StyleResolverState cannot be used in frame-less documents.
+    if (!styleResolutionHost->document().frame())
+        return nullptr;
+
     if (!m_resolvedFilter) {
         RefPtr<ComputedStyle> filterStyle = ComputedStyle::create();
         // Must set font in case the filter uses any font-relative units (em, ex)
         filterStyle->setFont(m_fontForFilter);
 
         StyleResolverState resolverState(styleResolutionHost->document(), styleResolutionHost, filterStyle.get());
         resolverState.setStyle(filterStyle);
 
         StyleBuilder::applyProperty(CSSPropertyWebkitFilter, resolverState, m_filterValue.get());
         resolverState.loadPendingResources();
@@ skipping 251 matching lines @@
         paint->setLooper(0);
         paint->setImageFilter(shadowAndForegroundImageFilter());
         return paint;
     }
     paint->setLooper(sk_ref_sp(shadowAndForegroundDrawLooper()));
     paint->setImageFilter(0);
     return paint;
 }
 
 } // namespace blink